The Shop-Vac Cartridge Filter Type U is designed to combat your toughest challenge, the filter can be used for both wet and dry pick up. It fit's Shop-Vac brand wet dry vacuums 5 gal and above (except 5 gal portable model H87S, 5 gal HangUp®, 5 gal wall mount and 6 gal long life model P12S vacuums). The approximate size of the cartridge is 8 in Dia and 6-1/2 in H.